摘要：9．Light much faster than sound.
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Our teacher told us light (光) _________ much faster than sound .
| A．travels | B．traveled |
| C．had traveled | D．will travel |
The teacher said light ______ much faster than sound.
[ ]
A. traveled
B. travels
C. will travel
D. had traveled
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B. travels
C. will travel
D. had traveled